2002 Pontiac Grand Am

Try the passlock relearn:Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
The vehicle is now ready to relearn the Passlockà † Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
Important: The vehicle learns the Passlockà † Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

Start the engine. The vehicle has now learned the Passlockà † Sensor Data Code and/or password.
With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles.
Try this, if the vehicle dosent start again replace the ignition switch, this is a very common problem. Also have it scanned for any theft deterrent codes, it probably has a B2960 code. Post back with what you find.

Yes it will happen again, but it could be tommorow or it could be a year from now, you can relearn it each time but thats not really fixing the problem its just putting a band aid on it. The ignition switch on these go bad all the time, if you get sick of relearing it replace the ignition switch and relearn it and this problem will go away, I"ve done so many of these at the dealer in the late 90"s. As far as the garage yes they did charge you to clear it and reset it, not much else. Post back with any other questions.